金属疲劳

机翼显示出金属疲劳的迹象。

The wing of the plane showed signs of metal fatigue .

问题原来是飞机机身出现金属疲劳。

The problem turned out to be metal fatigue in the fuselage .

寻求疲劳裂纹长度a与疲劳周次N的关系式是金属疲劳研究的一个重要课题。

It is an important subject of metal fatigue research to find out the formula of fatigue crack length a and cycles N.

从1963年Paris法则被提出以后的半个多世纪以来，在金属疲劳的研究中未能出现过崭新的概念。

Since Paris rule was proposed in 1963 , there have been no new concepts appearing in the metal fatigue field .

短疲劳裂纹群体行为描述的BP网络（BackpropagationNetwork）法和金属疲劳复效的瞬态能量输入法是应用生命科学进行材料疲劳损伤描述的重要研究方法。

S : Two important methods applied in life sciences to describe damage fatigue of materials are discussed , including BP ( back-propagation ) neural network describing collective short fatigue cracks and input of transient energy healing fatigue damage of metal .

实验的结果表明，改进的GEP算法对金属疲劳时间预测比传统的方法更准确，有很大的实用价值。

Experimental results show that the new GEP algorithm to metal fatigue time prediction is more accurate than traditional methods , which has great practical value .

最后把它运用到金属疲劳时间预测中，比较了原来的GEP算法和改进的算法的优劣，得出了比较理想的试验结果。

Finally , it applied to the prediction of metal fatigue time , GEP algorithm compared with in the merits of the original and the improved algorithm , obtained more satisfactory results .

研究发现，Seed等效方法源于金属疲劳问题的Palmgren-Miner累积破坏假设，将之应用于城市近场强地震动模拟带有明显的局限性，已不再合理。

Found , Seed equivalent method from metal fatigue problems Palmgren-Miner cumulative damage hypothesis , applied to the city of strong ground motion simulation of a direct type with obvious limitations , is no longer reasonable .

通过计算机模拟Weibull分布，指出最大似然法是它们中最好的方法，且推荐这种方法作为金属疲劳分析的统一方法。

By simulating Weibull distribution with a computer , it is pointed out that the method of maximum likelihood is the best approach among them . It is recommended that the maximum likelihood estimation be employed as the standard method in metal fatigue analysis .

新的GEP算法的整体结构更加简洁，理解更加容易，算法更加可靠。（3）利用改进的GEP算法对金属疲劳时间进行了预测。

The overall structure of new GEP algorithm is more simple and easier to understand , and the algorithm gets more reliable . ( 3 ) The use of the improved GEP algorithm to predict the time of metal fatigue .

本文的创新成果是提出一种改进的GEP算法，结合原来基因表达式编程的原理，利用改进的GEP算法对金属疲劳时间进行预测，得出了比较好的结果。

The innovation of this paper that advance a new genetic algorithm , which combined with the principle of the original gene expression programming , using the new GEP algorithm to predict the time of metal fatigue , and obtaining good results .

刷镀层对基体金属疲劳性能的影响

Effect of Brush Plated Deposition on Fatigue Performance of Base Metal

多晶体金属疲劳寿命随晶粒尺寸变化的理论研究

The relationship between fatigue life and grain size of polycrystalline metals

金属疲劳极限与静强度的相关性

Relativity of fatigue limit of metals with their tensile property

多晶体金属疲劳寿命的非平衡统计模型

Non-Equilibrium Statistical Model About the Fatigue Life of Polycrystalline Metals

金属疲劳条带显微图像的曲线拟合分析

A Curve Fitting Analysis of the Micro-Image for Fatigue Streaks in Metals

金属疲劳剩余寿命预测模型的一种探索

A Research on the Estimation of Remaining Service Life for Metals in Fatigue

用正电子湮没和超声衰减方法研究金属疲劳

Study of fatigue by PAT and ultrasonic decay method

金属疲劳裂纹初期扩展的特征及其影响因素

Studies of characteristics of fatigue crack propagation at near-threshold range and its affecting factors

他汽车上的零件可以经过几千英里的颠簸而不至于产生金属疲劳。

Parts in his automobile take thousands of miles of punishment without becoming tired .

金属疲劳扩展区和瞬断区的物理数学模型

Physical and mathematical models of fatigue propagation and final rupture regions for metallic materials

激光冲击抗金属疲劳断裂的激光参数优化试验研究

Study of Laser Parameters Optimum of Laser Shocking Against Fatigue and Fracture of Metal

短裂纹随机行为与金属疲劳损伤的理论分析

A theoretical analysis on stochastic behaviour of short cracks and fatigue damage of metals

金属疲劳断裂的热图研究

Thermography study on fatigue fracture of metals

激光冲击中应力状态和显微组织变化对金属疲劳性能影响

Effects of stress state and microstructure change on metallic fatigue performance under laser shock processing

首先分析了金属疲劳机理和滚压的强化理论，然后选择不同的工艺参数经过滚压后，测出其疲劳寿命。

First , the mechanism of metal fatigue strengthen the theory of rolling are analyzed .

提防金属疲劳之祸华航空难的教训

Metal Fatigue in China Airlines Accident

在研究金属疲劳损伤问题中，多轴疲劳问题一直是个难点。

The problem of multiaxial fatigue is still a difficulty in the study of metal fatigue .

航天技术战胜金属疲劳

Space technology combats metal fatigue

金属疲劳问题，已经成为人们在现代世界中必须要面对和研究的重点问题。

Metal fatigue has become to face the problem and focus of the study in the modern world .